Acylmethylene derivatives of arylothiazolines and aryloselenazolines



5 naphthothiazolines, benzoselenazolines and naphtflllized from ligTOin. ce w ce- In the case Patented M... 22,193 2,112,139 1 UNITED STATES PATENT oFFicr.

ACYLMETHYLENE DERIVATIVES 0F ARYLO- THIAZOLINES AND ARYLOSELENAZO- Leslie G. S. Brooker and Frank L. White, Rochester, N. Y., assignors, by mesne assignments, to Eastman Kodak Company, Jersey City, N. 1., a corporation of New Jersey No Drawing. ApplicationJnly 5, 1935, Serial No. 29,916

19 Claims. (oi. 26044) This invention relates to acylmethylene deremoved under reduced pressure and the residue rivatives of arylothiazolines and aryloselenazois Washed with Water to remove the soluble salts lines. More particularly, this invention relates of py d d y excess of the q terna y to acylmethylene derivatives of benzothiazolines, Salt- The Washed Product is dried and y thoselenazolines. Such compounds can be repreof the more insoluble compounds; recrystallizasented by the following general formula: from methyl alcohol is eflected- The pure compounds are usually colorless or slightly yellowish solids at ordinary temperatures.

10 Y These acylmethylene derivatives have been 10 l found to be useful in preparing symmetrical and unsymmetrical carbocyanine dyes, containing a substituent on the central carbon atom of the it trimethenyl chain. See our copending application Serial No. 30,736 filed July 10, 1935. 15

The object, therefore, of our invention is to wherein A represents a phenylene group, such provide acylmethylene derivatives of aryloas the phenylene group, the methylphenylene thiazolines and of aryloselenazolines, such as are group or the chlorphenylene group, or a naphformulated above. A further object is to prothylene group, Y represents sulfur or selenium, Vide a P100855 f t P p t of Such cOm- 20 R and represent alkyl groups, amlkyl groups pounds. Other more specific objects will become or and gmulm apparent upon a complete perusal of these speci- A general method for the preparation of these fica'tmns' new compounds is to treat a quaternary salt of The following examples serve to illustrate our an arylothiazole or an aryloselenazole with an invention but it is to be understood that our 25 vention is not limited thereby, except as ind1- acyl halide in the presence of an acid binding cated in the appended claims. agent. The reaction can be represented by the following condensation of the ethiodide of 1- Ell-ample --1-A zllmet ylene-2-me yl nzo- 0 methylbenzothiazole and acetyl chloride in the thiazoline 3 presence of pyridine: 291 g. (1 mol.) of the methiodide of l-methylon. com: s cm CCHi+ClC=0 C=CHC=O+C H;N.HCl+C HtN.HI N/ N/ C Hr I i l Acyl halides, such as acetyl chloride, propionyl benzothiazole (finely divided) was suspended in 40 chloride, crotonyl chloride, cinnamoyl chloride, one liter of dry pyridine. The suspension was 40 benzoyl chloride, furoyl chloride and phenylchilled to below 10 C. and 98 g. (1.25 mols) of acetyl chloride undergo condensation. Acyl acetyl chloride was added gradually with stirbromides or iodides can also be used. Ordinarily, ring. The reaction mixture was allowed to stand to effect a condensation, the quaternary salt is at a temperature below 10 C. for thirty minutes,

suspended in cold, dry pyridine, the suspension at room temperature for thirty minutes and 45 cooled to 10 to +10 C. and the acyl halide and finally was heated at 100 C. for twenty is added gradually to the chilled suspension, with minutes. The pyridine was removed by evapoag'itation. When the acyl halide is all added, ration under reduced pressure and the residue the reaction mixture is kept at 10 C. to was stirred with one liter of cold water, filtered +10 C. for fifteen to thirty minutes and then at and dried. The yield was 205 g. (practically 50 room temperature for twenty to sixty minutes. theoretical yield). The crude product was re- By this time the reaction mixture, which had crystallized from ligroin (boiling point -120 been viscous, thins out and solution is practically C.), .using cc. per gram of material. The complete. The whole is heated at 100 C. for yield of pure product was g. (73% of the theo- 55 about fifteen minutes. The excess of pyridine is retical). The compound was of a paleyellowish 55 color. Melting point 160 to 162 C. The formula of this compound is:

2 N in.

Example 2.-2-Methyl-1-propionylmethylenebenzothiazoline 29.1 g. 1 mol.) of l-methylbenzothiazole mothiodide (finely divided) was suspended in 100 cc. of dry pyridine.

ride was added gradually with stirring. The reaction mixture was allowed to stand at about 5 C. for twenty minutes, at room temperature for thirty minutes and finally was heated at 100 C. for about twenty minutes. The excess of pyridine was distilled off under reduced pressure and the residue was stirred with 800 cc. of cold water and the aqueous mixture allowed to stand for three hours. At the end of this time, the solid was filtered ofi, washed with water and air dried. Yield was 22 g. (practically theoretical). The crude product was recrystallized from 625 cc. of ligroin (boiling point 90-120 C.). The yield of the recrystallized product was15.4 g. (70%). The compound was of a pale yellow color, melting at 102-103 C. after two further recrystallizations from ligroin (boiling point 70 to 90 C.).

The formula of this compound is:

B CzHl 1 G=CH- =0 azoline 305 g. (1 moi.) of l-methylbenzothiazole ethiodide (finely divided) was suspended in one liter of dry pyridine. The suspension was chilled to below 10 C. and 98 g. (1.25 mols) of acetyl chloride was added gradually with stirring. Condensation was effected as in Example 1. The yield of crude dry product was 220 g. (practically theoretical). The crude product was recrystallized from 3500 cc. of ligroin (boiling point 90 to 120 C.). Yield was 168.5 g. (77%). A further recrystallization from three liters of ligroin (boiling point 90 to 120, C.) gave a pure product, melting at 111 to 113 C. and light yellow in color.

Example 4. Z-Ethyl-I -pr0pionylmethulenebenzothiazolz'ne 30.5 g. (1 mol.) of l-methylbenzothiazole ethicdide (finely divided) was suspended in 50 cc. of dry pyridine. The suspension was chilled to below 5 C. and 11.6 g. (1.25 mols) of propionyl chloride was added gradually with stirring. The reaction mixture was allowed to stand at 0 C. for about thirty minutes, at room temperature for about fifteen minutes and finally was heated at 100 C. for fifteen minutes. Most of the pyridine was removed under reduced pressure and the residue stirred with ice water. The aqueous mixture was allowed to stand at about 0 C. for several hours. The aqueous layer was decanted from the residue and the sticky mass was stirred with three separate portions of water. The resulting solid mass was dried in the air at ordinary The suspension was chilled to 5 C. and 11.56 g. (1.25 mols) oi propionyl chlotemperatures. The product did not lend itself to satisfactory recrystallization.

Example 5. 1-Benzoylmethylene-Z-ethulbenzothiazoline 12.2 g. (1 mol.) of l-methylbenzothiazoie ethiodide (finely divided) was suspended in dry pyridine (50 00.). 'The suspension was chilled to below 10 C. and 7 g. (1.25 mols) oi! benzoyl chloride was added gradually with stirring. The reaction mixture was allowed to stand at below 10 C. for thirty minutes, at room temperature for fifteen minutes and finally heated at 100 C. for twenty minutes. The pyridine was removed by distillation under reduced pressure. The solid residue was stirred with 200 cc. of cold water and allowed to stand over night at 0 C. The aqueous mixture was then filtered, washed with cold wa- Example 6 .--2-Allul-1-propionylmethylenebenzothiazoline 9.5 g. (1 mol.) of the alliodide of l-methylbenzothiazole (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was cooled to below 10 C. and 3.47 g. (1.25 mols) oi propionyl chloride was added gradually with stirring. The crude product was obtained by following the procedure given in Example 1. Yield practically theoretical. Recrystallization was effected from ligroin (boiling point 70 to 90 0.). Yield, 64%. A further recrystallization from ligroin gave a product melting at to 76 C. The compound was of a cream color.

Example 7. 1-Pr0pionylmethylene-Z-n-propylbenzothiazoline 9.6 g. (1 mol.) of the n-propiodide of 1- methylbenzothiazole (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was chilled to below 10 C. and 3.47 g. (1.25 mols) of propionyl chloride was added gradually with stirring. The crude product was isolated as in Example 1. Yield7.1 g. (97%). Recrystallization from ligroin (boiling point 70 to C.) gave a product melting at to 96 C. Yield-54%. Compound 01' a pale yellow color.

Example 8. 2 n-Butyl-I-propionylmethylenebenzothiazoline Example 9.4 Chloro 2 ethyl 1 propionulmethulenebenzothiazoline Equimolecular proportions of 4 chloro 1 methylbenzothiazole and ethyl-p-toluenesulfonate were heated at 100 C. for 7 days. The hard cake which formed was ground with acetone, chilled, filtered and finally washed with acetone and dried. Yield-90. 15.3 g. (1 mol.) of this salt (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was cooled to below 10 C. and 4.65 g. 1.25 mols) of propionyl chloride was added gradually with stirring. The crude product was isolated as in Example 1. Yield 91.5%. Two recrystallizations from ligroin (boiling point to C.) gave a product melting at 150 to 152 C. Yield 40%.

Example 10. I-Methyl-Z-propionylmethulenep-naphthothiazoline 7.7 g. (1 mol.) of the metho-p-toluenesulfonate of 2-methyl-p-naphthothiazole (finely divided) was suspended in 25 cc. of cold, dry pyridine. The suspension was chilled to below 10 C. and 2.03 g. (1.1 mols) of propionyl chloride was added gradually with stirring. The crude product was isolated as in Example 1. Yield-3.3 g. (81%). Two recrystallizations from ligroin (boiling point 70 to 90 C.) followed by a recrystallization from methyl alcohol gave a yellowish product, melting at 172 to 173 C. The formula of this compound is:

Example 11..? Acetulmethulene 1 ethyl p naphthothiazoline 4 g. (1 mol.) of the etho-p-toluenesulfonate of 2-methyl-p-naphthothiazole (finely divided) was suspended in 25 cc. of cold, dry pyridine. The suspension was chilled to below 10 C. and 0.865 g. (1.1 mols) of acetyl chloride was added gradually with stirring. The crude product was isolated as in Example 1. Yield-2 g. (74%). Recrystallization from ligroin (boiling point 90 to 120 C.) followed by a recrystallization from methyl alcohol gave a yellowish product melting at 182 to 184 C.

Example 12. 1 -Ethyl-2-propioaylmethylene-pnaphthothiazoline 8 g. (1 mol.) of the etho-p-toluensuli'onate of 2-methyl-p-naphthothiazole (finely divided) was suspended in 25 cc. of cold, dry pyridine. The suspension was chilled to below 10 C. and 2.3 g. (1.25 mols) of propionyl chloride was added gradually with stirring. The crude product was isolated as in Example 1. Yield-4.35 g. (76%). Two recrystallizations from; ligroin (boiling point 90 to 120 C.) gave a yellowish product melting at 119 to 120 C. Yield-54.4%.

Example 13. 1 -Acetylmeth1llene-2-ethulbenaoselenazoline 14.08 g. (1 mol.) of the ethiodide of l-methylbenzoselenazole (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was chilled to below 10 C. and 3.92 g. (1.25 mols) of acetyl chloride was added gradually with stirring. The crude product was isolated as in Example 1.

- iy theoretical).

After two recrystallizations from ligroin (boiling point 90 to 120 C.) a yellowish product melting at 99 to 100 was obtained. Yield-25%. The

formula of this compound is:

can! 1 C=CHC=0 I (hm Example 14.-- 2- Ethyl 1 propionylmethulene benzoselenazoline 14.08 g. (1 mol.) of the ethiodide of l-methyl- .benzoselenazole (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was chilled to below 10 C. and 4.65 g. (1.25 mols) of propionyl chloride was added gradually with stirring. The crude product was isolated as in Example 1. After recrystallization from ligroin (boiling point 90 to C.) a yellowish product melting at 67 to 68 was obtained.

Example 15. 1 Trichlo'roacetylmethylene 2 ethylbenzothiazoline at room temperature, with frequent agitation, for

thirty minutes and finally was heated at 100 C. for fifteen minutes. The major part of the pyridine was distilled oil! under reduced pressure and the residue well stirred with 300 cc. of cold water. The aqueous mixture was allowed to stand at 0 C. for about twelve hours. The solid material was filtered off, washed with water and air dried at ordinary temperatures. The yield of crude product was 12.9 g. (practically theoretical). Recrystallization from 1400 cc. of ligroin (boiling point 70 to 90 C.) followed by two recrystallizations from methyl alcohol (19 cc. per gm. of material) gave pale yellow needles. Melting point 139-141 C. Yield 7.8 g. (60%).

Example 16.2-Ethyl-1-lauroylmethylenebenzothiazoline 14 g. (1 mol.) of l-methylbenzothiazole ethop-toluene-sulfonate (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was chilled to below 0 C. and 10.93 g. 1.25 mols) of lauroyl chloride was added gradually with stirring. The crude product was isolated asln Example 15. Yield 14.4 g. (practical- The crude product was recrystallized once from 275 cc. of ligroin (boiling point 70 to 90 C.) and a second time from 220 cc. of ligroin (boiling point 35 to 55 C.). A slightly reddish powder was obtained melting at 59 to 61 C. Yield 9.4 g. (6.5%). The formula of this compound is:

Example 17.- 2 Ethyl-1-.furoylmethylenebenzothiazole 14 g. (1 mol.) of l-methylbenzothiazoline etho- 4 p-toluene-sulfonate (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was chilled to below 0 C. and 6.53 g. (1.25 mols) of furoyl chloride was added gradually with stirring. The crude product was isolated as in Example 15. Yieid-practicaliy theoretical. The crude product was recrystallized from 2500 cc. of ligroin (boiling point to C.) The first crop of crystals (9.5 g.) was recrystallized again from ligroin (boiling point 90 to 120 C.-185 cc. per gram of material) and a further recrystallization was effected from n-propyl alcohol (4.5 cc. per gram of material). Yield 58%. Melting point to 152 C. The formula of this compound is:

nc--cn n s l\ 1 o==cn- =0 :11: Example 18.-2-Ethyl-1 -(m-nitrobenz01 l) -methylenebenzothiazole 14 g. (1 moi.) of l-methylbenzothiazoline ethop-toluene-sulfonate (finely divided) was suspended in 50 cc. of cold, dry pyridine. The suspension was chilled to below 0 C. and 9.28 g. (1.25 mcls) of m-nitrobenzoyl chloride was added gradually with stirring. The product was isolated as in Example 15. Yield of crude product was 13.1 g.-

practically theoretical. Several recrystallizations from ligroin (boiling point 90 to120 C.) followed by a recrystallization from methyl alcohol (640 cc. per gram of material) gave minute yellow crystals melting at 239 to 240 C. The formula of this compound is:

From these examples it is apparent that a large number of acylmethylene derivatives of benzothiazolines, naphthothiazolines, benzoselenazo lines and naphthoselenazolines can be prepared by our process. It is further apparent that substituents in the benm or naphtho nucleus do not affect the course of the reaction.

In preparing carbocyanine dyes from these new acylmethylene derivatives according to the process set forth in our copending application Serial No. 30,736, filed July 10, 1935, the acylmethylene derivatives are reacted with cyclammonium quaternary salts containing a reactive methyl group in the alpha or gamma position, in the presence of a. water-binding agent, such as acetic anhydride or the like.

What we claim as our invention and desire to be secured by Letters Patent of the United States is:

1. A compound of the following formula:

wherein A represents an organic group selected from the group consisting of phenylene and napthylene groups, R represents an alkyl group, R represents an organic group selected from the group consisting of alkyl, aralkyl and aryl groups and Y represents an atom selected from the group consisting of sulfur and selenium. 2. A compound of the following formula:

Y a A/ c=cH-c=o wherein A represents an organic group selected from the group consisting of phenylene and naphthylene groups, R and R represent alkyl groups and Y represents an atom selected from the group consisting of sulfur and selenium. 3. A compound of the following formula:

wherein A represents a phenylene group, R and R represent alkyl groups and Y represents an atom selected from the group consisting of sulfur and selenium.

5. A compound of the following formula:

wherein R and R' represent alkyl groups.

6. A 1-acetylmethylene-2-alkylbenzothiazoline. 7. A 1-propionylmethylene-z-alkylbenzothiazoline.

8. A compound of the following formula:

R A c=cn-$=o wherein A represents a naphthylene group and R and R represent alkyl groups.

9. A 2-acetylmethylene-l-alkyl-s-naphthothiazoline.

10. A process for preparing an acylmethylene compound comprising condensing, in the presence of an acid-binding agent, an acyl halide containing at least two carbon atoms with a compound of the following formula:

C-CH:

wherein A represents an organic group selected from the group consisting of phenylene and naphthylene groups, R represents an alwl group, X represents an acid radical and Y represents an atom selected from the group consisting of sulfur and selenium;

11. A process for preparing an acylmethylene compound comprising condensing, in the presence of an acid-binding agent, an acyl chloride containing at least two carbon atoms with a compound of the following formula:

wherein A represents an organic group selected from the group consisting of phenylene and naphthylene groups, R represents an allwl group, X represents an acid radical and Y represents an atom selected from the group consisting of sulfur and selenium.

12. A process for preparing an acylmethylene compound comprising condensing, in the presence of a tertiary organic base, an acyl chloride containing at least two carbon atoms with a compound of the following formula:

wherein A represents an organic group selected from the group consisting of phenylene and naphthylene groups, R represents an alkyl group, X represents an acid radical and Y represents an atom selected from the group consisting of sulfur and selenium.

13. A process for preparing an acylmethylene compound comprising condensing, in the presence of pyridine, an acyl' chloride containing at least two carbon atoms with a compound of the following formula:

wherein A represents an organic group selected from the group consisting of phenylene and naphthylene groups, R represents an alkyl group,

X represents an acid radical and Y represents an atom selected from the group 14. A process for preparing an acylmethylene compound comprising condensing, in the presence of pyridine, an acyl chloride containing at least two carbon atoms with a compound of the following formula:

- wherein A represents an organic group selected from the group' consisting of phenylene and naphthylene groups, R represents an alkyl group and Y represents an atom selected from the group consisting of sulfur and selenium.

15. A process for preparing an acylmethylene compound comprising condensing, in the presence of pyridine, an acyl chloride containing at least two carbon atoms with a compound of the wherein A represents an organic group selected from the group consisting of phenylene and naphthylene groups, R represents an alkyl group and Y represents an atom selected from the group consisting of sulfur and selenium.

16. A process for preparing an acylmethylene compound comprising condensing, in the presence of pyridine, an acyi chloride containing at least two carbon atoms with a quaternary salt of l-methylbenzothiazole.

17. A process for preparing an acylmethylene compound comprising condensing. in the presence of pyridine, an acyl chloride containing at least two carbon atoms with an alkiodide of l-methylbenzothiazole.

18. A process for preparing an acylmethylene compound comprising condensing, in the pres ence of pyridine, an acyl chloride containing at least two carbon atoms, with a quaternary salt of z-methyl-p-naphthothiazole.

19. A process for preparing an acylmethylene compound comprising condensing, in the pres-. ence of pyridine, an acyl chloride containing at least two carbon atoms with an alkyl-p-toluenesulfonate of Z-methyI-B-naphthothiazole.

LESLIE G. S. BRDOKER. FRANK L. WHITE. 

